Looper-thread controller for buttonhole-sewing machines



June 3, 1930. czLcws 1,761,349

LOOPER THREAD CONTROLLER FOR BUTTONHOLE SEWING MACHINES Filed Jan. 9. 1928 2 Sheets-Sheet 1 W/f/VESSES 4E0 razmws/r/ uttonmq June 3, 1930. KozLowsKl LOOPER THREAD CONTROLLER FOR BUTTONHOLE SEWING MACHINES 2 Sheets-Sheet. 2

Filed Jan 9, 1928 s M 5 E m W Patented June 3, 1930 PATENT oFFics V LEO KOZLOWSKI, OF ST. PAUL, MINNESOTA LOOPER-THREAD CONTROLLER non BUTTONHOLE-SEWING MACHINES Application filed January 9, 1928. Serial No. 245,486.

This invention relates to the class of sewing machines and pertains particularly to a looped thread feeder for button hole stitching machines.

The primary object of this invention is to provide a looper thread feeder in substitution for the-present cam actuated thread controller or pick up bar, which can be adjusted tofeedthread to the looper mechanism so as to overcome the strain which is placed upon the needle thread in those machines employing theoscillating thread pick up bar.

Another object of this invention is to provide. a device which will efiiciently take care of the looper thread and which will be of simple construction permitting the operation of the machine with a fewer number of parts and thereby materially reducing the cost of constructing the machine.

The invention will be best understood from a consideration of the following detailed description, taken in connection with the accompanying drawings forming a part of the present specification, with the understand ing, however, that the invention is not confined to any strict conformity with the showing of the drawings, but may be changed or modified solong as such changes or modifications mark no material departure from the salient features of the invention as expressed in the appended claims.

In the drawings Figure 1 shows the lower portion of the turret and a portion of the machine structure lying adjacent thereto showing the manner in which the looper thread controller attachment embodying the present invention is secured in position,

Figure 2 is a section taken upon the line 2-2 of Figure 1,

Figure 3 is a section taken upon the line 3-3 of Figure 2,

Figure 4 is a detailed perspective view of the looper thread controller attachment,

Figure 5 shows a modified type of looper thread controller inposition,

Figure 6 is a section taken upon the line 66 of Figure 5, s

Figure 7 is a detailed perspective view of the looper thread controller shown in Figures 5 and 6,

Figure 8 is a further modification of the looper thread controller, and

Figure 9 is a detailed perspective view of the looper thread controller shown in operative position, in Figure 8.

Referring now to the drawings in detail wherein like numerals of reference indicate corresponding parts throughout the several views, the numeral 1 indicates a conventionally shown turret of a buttonhole stitching machine of the character in connection with which the present invention is used. The turret frame is indicated by the numeral 2 and extending downwardly from the turret 1 is the usual loop retainer driving bar and as sociate parts indicated generally by the numeral 3.

The device embodying the present inven tion is designed to be substituted for the present pivotally mounted and cam actuated pick up bar and thread controller which governs the feeding of the looper thread to r the looper devices.

In the present stitching machine structure the lower portion of the turret frame 2 has secured thereto a pair of tension discs 4 between which the looper thread, indicated in dotted lines by the numeral 5, passes moving around the discs and over a thread retainer 6 which is carried by and projects from the face of an elongated plate 7 which is secured to the face of the turret frame between the tensiondiscs and the loop retainer driving bar'3 as clearly shown in Figure 1. This plate 7 is secured in position by a screw 8 which engages in the frame 2 in the manner shown. .Adjacent the upper end of the plate 7 is a thread guide eyelet 9 through which the looper thread passes before passing about the discs 4:.

The thread feed device embodying the present invention is secured in position against the turret frame behind the plate 7, by the plate holding screw 8 and as is shown in Figure 4 this thread feeder comprises an elongated wire loop 10 one side of which is extended as at 11 terminating in the right angularly projecting portion 12, which por- III tion is looped to provide a thread guide eye or controller 13 of the type usually employed upon machines of this character. The position of the plate 7' is such that the looper thread after passing about the discs 4: runs upwardly to pass over the thread retainer 6 and is then led directly downwardly from the thread-retainer 6 to and through the thread controller 13, this part being adjusted to the position which is found to be most efficient in the operation of the machine. The thread then passes directly to and through the hollow loop retainer driving bar 3 to the looper mechanism. It will be seen from the foregoing tl at the looper thread controller is readily and easily adjustable independent of the position in which the plate 7 is secured.

In Figures 5 to 9 inclusive there are shown several modified forms of the looper thread controller device. The device shown in Figures 5, 6 and 7 comprises an elongated plate member 14 having a longitudinally extending slot through which the screw 8 which secures the plate 7 in position, may pass, this slot 15 permitting the longitudinal adjustment of the plate 14; on the screw in the same manner as the elongated loop portion 10 of the device shown in Figure 4 permits the adj ustment of this device on. the screw.

The lower end of the plate 14 has a right angularly and forwardly projecting ear 16 which ear has a slot 17 cut therein from the forward edge which terminates in the opening 18. As will be readily understood the looper thread is slipped through the slot 17 to position in the opening 18 to. be fed therethrough in the usual manner.

The modified form shown in Figures 8 and 9 comprises an elongated plate 20 having a longitudinally extending slot 21 therein and having projecting from one face thereof adj acent one end the wire 22 which is formed to provide the controller 23, similar in character to the controller 13 which is formed integral with the wire frame 10. Like the plate 14 this plate 20 is designed to be positioned behind the plate 7 to have the screw 8 passed through the slot so that the plate 20 will be adjustably held in position by the pressure of the plate 7 thereagainst.

From the foregoing it will be seen that any one of the devices 10, 14 and 20 can be placed in position on the machine and readily adj usted until the best working position of the looper thread controller is determined, after which the device can be securely fixed by tightening the supporting screw 8.

It is of course understood that means may be provided whereby the looper thread guide eye may be permanently fixed to the turret frame, after the proper position therefor has been determined, instead of adjustably mounting it thereon, and applicant does not wish to be limited in any way to the adjustment feature.

Having thus described my invention what I claim is 1. In a button hole stitching machine, the combination with the frame and the looper retainer driving bar of the machine, of looper thread tensioning means mounted on the frame, a retainer for the thread mounted on the frame between said driving bar and tensioning means, a controller for the thread arranged below said retainer and the lower end of said driving bar, and means suspending the controller from the frame, the thread passing through said tensioning means, retainer, controller and driving bar in the order named.

2. In a button hole stitching machine, the combination with the frame and the looper retainer driving bar of the machine, of looper thread tcnsioning means mounted on the frame, a retainer for the thread mounted on the frame between said driving bar and tensioning means, a controller for the thread arranged below said retainer and the lower end of said driving bar, and means suspending the controller from the frame for adjustment vertically with respect to said retainer, the thread passing through said tensioning means, retainer, controller and driving bar in the order named.

In testimony whereof I aflix my signature.

LEO KOZLOWSKI. 

